Electric switch and signal apparatus.



, No. 776,238. 1 PATENTED NOV. 29, 1904.

" L. GRIFFITH.

ELECTRIC SWITCH AND SIGNAL APPARATUS.

. APPLIOATIQN FILED oo'1.1a, 1904. No MODEL. s SHBETs-SHBBT 1.

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' L. GRIFFITH.

ELECTRIC SWITCH AND SIGNAL APPARATUS.

APPLIoATIoN FILED OOTQIB, 1904.

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No. 776,238. PATENIED NOV. 29, 1904.

L. GRIFFITH.

ELECTRIC SWITCH AND SIGNAL APPARATUS. APPLIOATION Hmm 00T. 1e, 1904. vNoMODEL. a sums-SHEET a.

UNITED STATES atented November 29, 1904.

PATENT @einen LAWRENCE GRIFFITH, OF YONKERS, NEV YORK.

ELECTRIC SWITCH AND SIGNAL APPARATUS.

SPECIFICATION forming part of Letters Patent N 0. 776,238, datedNovember 29, 1904;.

Original application led March 28, 1903, Serial No. 149,961. Divided andthis application tiled October 18, 1904. Serial No. 228,971. (No model.)

To @ZZ whom t may concern:

Be it known that I, LAWRENCE GRIFFITH, a citizen of the United States ofAmerica, residing in the city of Yonkers, county of VVestchester, andState of New York, have invented certain new and useful Improvements inElectric Switch and Signal Apparatus, of which the following is aspecification, reference being had therein to the accompanying drawings.

My invention relates generally to apparatus for operating railwayswitches, signals, and the like by means of electricity, and comprises,among other features, two electric units, one for operating thetraffic-controlling device and the other for operating a lockingorindicating device connected through switches or controllers yby fourcircuits, automatic means for indicating to the operator when an outsideor accidental currentis in the circuit,

automatic means forlocking the operators' electric switch against areturn movement until the operator has received an indication that ltherailway-switch or traino-controlling device has been fully opened orclosed, automatic meansA for indicating lto the operator after operatingthe electric switch to open or close the railway-switch when therailwayswitch .is notV for any reason fully opened or closed thereby,automatic means for locking the electric. switch against a returnmovementv until it has been fully thrown and the railway-switch is,fully opened or closed in case the operator has received no indicationof any I defect in the operation of the device, and automatic means, forreplacmg the railwayswitch independently of the operators leverY andelectric switch in case 1t is moved fromv the position in which it hasbeen left.

Y The electric switehabove referred to is de-` scribed in full in mypending application for a patent therefor, being application Serial No.213,335,1iled January 20, 1904, and divisional of my application SerialNo. 149,961, of which application Serial No. 149,961 this is also adivisional application.

In order that my invention may be clearly understood, I shall iirstdescribe in detail the mode in which I carry the same into practice andthen point out the novel features of thel in which similar parts aredesignated by like,

numbers in all the figures.

Figure 1 is diagrammatic view illustrating the principal parts of anelectric railwayswitch and signalV apparatus embodying the main featuresof my invention. Fig. 2 is a detail view illustrating the Inode ofconnecting the switch-operating lever` with the tappet of a well-knownvinterlocking device. Figs. 3, 4, 5, 6, 7, and 8 are diagrammatic detailviews hereinafter described, illustrating six positions of the operatorselectric switch in opening and closing the railway -switch. Fig. 9 is adiagrammatic view of a modilication, illustrating a rheostat andconnections for throwing the full power of the motor `on therailway-switch at its initial movement in either direction.

In Figs. 1 and 2 the main rails 14,Vr the switch-points 15, themotion-plate 16, the cam and locking-slot therein 17, the pin orfrictionroller 18, riding in said cam and locking-slot 17, the bar 19,and the switch-locking lugs 21 and 22 on the motion-plate 16 are all ofa well-known descriptionand substantially as shown and described in myUnited States Letters Patent issued to me March 31, 1903, for pneumaticswitch apparatus and valve therefor. The railway-switch and connectingparts are shown in Fig. 1 in closed or normal position, so that trainswill keep the main track. To move the motion-plate 16 longitudinally ineither direction, and thereby open or close the railway-switch and lockit in either position in the usual manner, I employ an electric motor28, carrying on its armature-shaft a small gear-wheel 29, which engagesa largo gear-wheel 30, connected by a pitman 31 with the motion-plate16, and the windings ofthe field-magnets 32 and the armature 33 of themotor are such that w hen an electric current is sont through one partof the field-coil the motionplate 16 will be shifted in one direction toopen the switch, and when the current is sent through the other part ofthe field-'coil the motion-plate will be shifted in the oppositedirection to close the switch;

For controlling the action of the motor, and thereby the railway-switch,from the switchtower, for example, I employ, as best shown in Figs. 1,2, 3, 4, 5, 6, 7, and 8, an operating-shaft 34, which is suitablymounted in the switch-tower and has an operating-handle 35 for rockingit, an electric switch-operating arm 36, and a locking arm or plate 37.The locking-plate 37 is formed with a segmental slot 38, in which worksan antifriction-roller mounted on a pin 39 and in the middle oi' whichslot is a depending locking-lug 40, around which the slot is widened topermit the passage of pin 39 when the pin is lowered, and which lugengages the pin when the pin is elevated so as then to prevent the lever36k from being thrown from either end position to the opposite position.

The locking-pin 39 is lixed on the end of an endwise-movable rod 41,suitably held against other than longitudinal movement and carrying onits opposite end an armature 42 in the magnetic iield oi' an electricmagnet 43. The

I arrangement is such that when a current is passed through the coils ofthe electromagnet 43 the armature will be attracted so as to raise thelocking-pin 39 and lock the operating-lever 36 against movement fromeither end position; but when there is no currentpass.- ing through thecoils of the field-magnet 43 the locking-pin 39 is free to fall beneaththe locking-lug 40, and the operating-lever 36 can thus be thrown by itshandle 35 from either end position..

The operating-lever 36 is connected by a rod 44 with the top movablemember 45 of an electric switch 48, the bottom member 47 of which ishere shown xed and the middle member 46 of which is shown movable overthe bottom member 47.

Oi' course I do not limit myself to the particular arrangement of thethree parts of the electric switch 48 as shown and described. It will bereadily understood that the two movable parts could be arranged to moverelatively with the stationary part were they placed horizontallyinstead of vertically or it they were arranged to move with reference toeach other, as the parts of a fan, the main feature being an electricswitch having two parts movable relatively to a third and onel of thetwo parts depending for its motion upon the movement of the other movingpart during part of its stroke. The top and middle members are mountedto slide longitudinally relatively to each other and to the bottommember in suitable guides. The middle switch member 46 has dependinglugs 51 and 52 at its respective ends to abut against the ends of thebottom member 47 and limit the travel oi' the middle member thereon ineither direction. The top member 45 has depending lugs 53 and 54 at itsrespective ends to abut against the ends of the middle member 46 andcarry said member with it until stopped therewith at the end of itstravel in either direction.

The top member 45 of the electric switch 48 has on its under sideinsulated electric contact-heads 55, 56, 57, 58, 59, and 60,respectively, the bottom member 47 has on its upper side insulatedelectric contact-heads 61,62, 63, 64, 65, and 66, respectively, and themiddle member 46 has insulated in it electric double contact-heads 67,68, 69, 70, 71, and 72, respectively, to engage in certain positions ofthe switch members certain ot' the contactheads in both the top memberand in the bottom member,and thereby act as circuit-makers orcircuit-breakers between said top and bottom contact-heads, as shown inFigs. l, 3, 4, 5, 6, 7, and 8 and hereinafter more fully described.

Another electric switch 73 is mechanically connected with themotion-plate 16 or otherwise adapted to be moved in correspondence withit,vas indicated in Fig. 1. This switch 73 consists of a sliding forkedmember 74, which is connected by a rod 75 with the motionplate 16, so asto be actuated thereby and with the railway-switch in both directions,and has on one branch a short insulated double contact-head orcircuit-maker 76 and on the other branch two long insulated doublecontact-heads or circuit-makers 77 and 78, respectively. The shortdouble contact-head 76 is adapted to engage and connect electricallyboth of either pair of insulated fixed contactheads 79 and 80 or 81 and82, accordingly as the motion-plate 16 and railway-switch is closed oropened, respectively. The long double contact-head 78 is adapted toengage and electrically connect both of a pair of insulated iixedcontact-heads 83 and 84 while the railway-switch is closed and until itis fully opened, and the long double contacthead 77 is adapted to engageand electrically connect both of a pair of insulated fixed contact-heads85 and 86 while the railway-switch is opened and until it is fullyclosed.

rEhe electric motor 28 is electrically connected with a battery 87 orother source of electrical current and with the several contact-heads ofthe triple electric switch 48, the electromagnet 43, and thecontact-heads of the electric switch 73, actuated by the motionplate, bysuitable wires or conductors, as shown diagrammatically in Fig. 1 and aswill now be fully described in explaining the operation oi' theapparatus.

The railway-switch is shown closed in Fig. l. In this position of therailway-switch the pairs of contact-heads 83 and 84 and 79 and areelectrically connected by the electric switch 73 and the pairs ofcontact-heads 85 and 86 and 8l and 82 thereof disconnected. At thc sametime the pairs of contact-heads 56 62 and 59 65 of the triple switch 48are TOO IIO

IIS

electrically connected and all the other pairs' thrown to the positionindicated in Fig. 3,

the top member 45 of said switch is moved until its lug 53 meets thecorresponding end of the middle member.46;' but the middle member 46remains undisturbed. In this position the contact-heads 56 and 62 areelectrically connected by the circuit-maker 68; but all the other pairsof contact-heads on the top and bottom switch members 45 and 47 aredisconnected, so that, as will be seen, both the electromagnet 43 andthe electric motor 28 are out of circuit with the battery 87, and thelever locking-rod 41 is free to drop by gravity beneath the locking-lug40 and permit the said operating-lever to be thrown to its full extentin the direction of the arrow in Fig. 5 for opening the railwayswitch,as hereinafter described. If, however, there should be any accidental ordisturbing current in the electromagnet-circuit, said current would flowthrough the wires 101 and 118, the contact-heads 56, 68, and 62, thewires 119 and 98, and thence through the electromagnet 43, so that saidmagnet would attract the armature 42, raise the locking'- `l rod 41 andvthrough the'engagement of the pin 39 with the lug 40 eifectually bar thefurther movement of the operating-lever and consequent opening of theswitch. The operator would thus be automatically notified that somethingwas wrong with the circuit and could have the necessary correction made.

Vhen the operating-lever 36, being freed from its locking device, isthen further swung to the position shown in Fig. 4, the top member 45will by means of its end lug 53 have carried with it to the bottommember 47 the middle member 46, so that the contact-heads 60 and 66 willbe electrically connected by the circuit-closer 72, the contact-heads 57and 63 electrically connected by the circuit-closer 69, and all theother pairs of contact-heads on the top and bottom members disconnected.In this position the circuit of the lockingelectromagnet 43 is stillopen, but the motorcircuit is closed and the current flows from thebattery 87 through the wires 88 89, the brushes 90 and armature 33 Aofthe motor, the wire 91, right-hand half 92 of the motor field-coil, thewire 93, contact-head 84 of the electric switch 73, the circuit-closer78, the contact-head 83 thereof, the wire 94, the contacthead 66,circuit-closer 72, and contacthead 60 of the operators electric switch48, and thence through the wires 95 and 96 to the opposite pole of thebattery 87, or vice versa. The field-magnets of the motor 28 are thusenergized and the armature 33 there-u of turned in one direction, so asthrough the connections described to pull the motor-plato 16 and openthe railway-switch to its fullest eX- tent. At the same time by thisfull operation of the motion-plate and switch-points the forked memberof the electric switch 73 connected therewith is shifted, so that thecontact-heads 81 and 82 thereof are electrically connected by thecircuit-closer 76 and the contact-heads 85 and 86 electrically connectedby the circuitcloser 77, while at the same time the contactheads 79 and8() are disconnected and the contact-heads 83 and 84 alsov disconnected.This automatic movement of the electric switch 73 breaks themotor-circuit, as will be seen, thus stopping the motor; vbut at thesame time it closes the circuit of the electromagnet 43, and the currentthen {iows from the battery 87 through the wires 88 and 97, the coils ofthe electromagnet 43, the wires 98 and99, thecontact-head 63 of theoperators,switchV 48, the circuit-closer 69 thereof, the contact-'head57, the wires 100 and 101, the contact-head 81 of the electric switch73, the circuit-closer 76, the contact-head 82, the wire 94, thecontacthead 66, circuit-closer 7 2, and contact-head 60 of the operatorsswitch 48, and thence through the wires 95 and 96 to the opposite poleof the battery 87. The electromagnet 43 is thus energized, its armature42 attracted,

and the operating-lever 36 locked by the raised pin 39, barring the lug40 against a return movement to the left, as shown in Fig. 4, so thatthe operating-lever 36 cannot be thrown back until after it has beenthrown forward to its fullest extent, as shown in Fig. 6. If, however,the railway switch-points should not be thrown to their fullest extentby this operation of the electric switch, thecircuit-closer 76 of theautomatic switch 73 would not close connection between the contact-heads81 and 82 and the electromagnet 43 would not be energized and thelocking-pin 39 would not be raised to locking position, thus indicatingto the operator that the switch-points were not fully thrown. He wouldthen throw the operating-lever 36 back again, which motion would bringthe lug 54 of the top member 45 of the switch against the end of themiddle member 46, thereby bringing the topcontactheads 58 and 59 intoelectric connection with the bottom contact-heads 64 and 65, as shown inFig. 5. This will energize the lockingmagnet 43 and raise thelocking-pin 39 and allow the operating-lever 36 to be swung back to itsoriginal position until the fault in the railway-switch is corrected.When the operating-lever 36 is then thrown to its position shown in Fig.6, the top member 45 of the operators switch 48 will have moved andcarried with it by means of its end lug 53 the middle member 46 untilthe end lug 51 of the latter` is stopped by thc end of the bottom member47. In this position the contact- TOO IIO

ISO

heads 55 and 61 are electrically connected by the circuit-closer 67 andthe contact-heads 60 and 66 by the circuit-closer 72; but all the otherpairs of contact-heads on the top and bottom members are disconnected,so that, as will be seen, not only does the motor-circuit remain openand the motor thus idle, but the electromagnet-circuit is opened,thereby freeing the armature 42 and locking-pin 39 and leaving theoperating-lever 36 free to be thrown in a reverse direction for closingthe switch. When the operating-lever 36 is then swung in a reversedirection, as shown by the arrow in Fig. 7 and reaches the positionshown in said Fig. 7, the contact-heads 55 and 61 of the switch 48 arestill electrically connected by the circuit-closer 67; but all the otherpairs of contact-heads on the top and bottom members of the switch 48are disconnected, so that both the motor and locking-magnet circuits areopen and the lever locking-pin 39 free to drop beneath the locking-lug40 and permit the operating-lever to be thrown reversely. In case,however, of `an' accidental current in the circuit and consequentenergization of the locking-magnet 43 the barring of operating-lever 36by the locking-pin 39 would notify the operator of the fact, the currentflowing through the wires 108 and 120, contact-heads 55, 67, and 61, thewires 121 and 98, and .thence through the electromagnet 43.

Vhen the operating-lever, being unlocked, is thrown reversely to theposition shown in Fig. 8, the top member 45 of the operators switch; 48will, by means of its end lug 54, have moved the middle member 46 to theposition shown in said figure. In this position the contact-heads 59 and65 will be electrically connected by the circuit-closer 71 and thecontact-heads 58 and 64 by the circuit-closer 70, andall the other pairsof contact-heads will be disconnected, so that the motor-circuit will beclosed, and the current will flow from the battery 87 through the wires88 and 89, motor-brushes 90, armature 33, wire 91, through the left-handpart 102 of the motor field-coil in a reverse direction to thatpreviously described, through the wire 103, the contact-heads 86 and 85,now electrically connected by the circuit-closer 77 of the switch 73,through the wire 104, the contact-heads 65 and 59, connected by thecircuit-closer 71, and thence by the wires 105 and 96 to the other poleof the battery 87, or vice versa. The motor 28 is thus energized so asto throw the motion-plate 16 in a reverse direction and return theswitch to the original closed position. (Shown in Fig. 1.) At the sametime the motion-plate 16 moves the forked member of the switch 73 backto the position previously kdescribed and shown in Fig. 1, in whichposition the pairs of contact-heads 83 and 84 and 79 and 80 areelectrically connected and the pairs of contact-heads 81 and 82 and 85and 86 disconnected. In this position (shown in Fig. 8) themotor-circuitr is broken and the motor stopped; but the locking-magnetcircuit is closed, and the electric current fiows from the battery 87through the wires 88 and 97, the coils of the magnet 83, vthe wires 98and 106, the electrically-connected contactheads 64 and 58, the wires107 and 108, the electrically-connected contact-heads 79 and 80 of theswitch 73,' the wire 104, the electrically-connected contact-heads 65and 59, and thence through the wires 105 and 96 to the battery 87. Thelocking-magnet 43 is thus energized and the operating-lever locked bythe pin 39 against a new forward movement, so that it must be thrownreversely to its full limit before it can be freed. If, however, asbefore described, the railway-switch is not fully thrown by saidoperation of the electric switch 48, the circuit-closer 7 6 of theautomatic switch 73 will not have connected the contact-heads 79 and 80and would not be raisedto locking position, thus indicating to theoperator that the railway-switch has not been fully thrown. He will thenthrow the operating-lever back again, as previously described, in theother direction, bringing the top contact-heads 57 and 60 intoelectrical contact with the bottom contact-heads 63 and 66. When theoperating-lever is then thrown reversely to its fullest extent, theswitch 48 is thrown to its original position first described and shownin Fig. 1, in which position both the motor and locking-magnet circuitsare opened and the operating-lever free to be thrown to open therailway-switch, as previously described.

It will be seen that after the locking-lug 40 is swung by theoperating-lever 36 in either direction past the locking-pin 39 the saidpin locks the operating-lever against a return movement until the throwof the switchpoints and the motion-plate by the motor shifts theelectric switch 73 and frees the locking-pin 39 and lever 36, asdescribed, thus notifying the operator that the switch is fully thrown.

The motor 28 (shown in Fig. 1) has the fieldcoil divided into two parts92 and 102, said parts each leading to the two terminals of the motor.It will be readily understood that by this device a useful method ofreversing the motor is provided. In Fig. 9 I have illustrated anotherform of motor 280 andits connecting-wires 89, 91, 93, and 103, in whichthe wire 91 instead of leading to the common terminal of the two partsof the field-coil of the motor, as indicated in Fig. 1, leads topivoting-post 110 of the switch-lever 111, which is mechanicallyconnected by a rod 112 with the movable member of the switch 73 and withthe motion-plate 16, so as to be moved therewith. The free end of theswitch-lever 111 is adapted to make electrical contact with any of aseries of contactheads 113, 114, 115, and 116, electrically connectedwith successive IOO IIO

turns of the motor-coil 117. The arrangement is such that when therailway-switch is closed and is to be opened the switch-lever willengage the contact-head113 at the opposite end of the motor-coil fromthe wire 98, as indicated in Fig. 9, so that when the current isswitched on, as previously described herein, it will How through thewire 91,switehlever 111,contacthead113,and thence through the entirelength of the coil to the returnwire 98, so that the full `power of themotor will be available to start the switch-points. Then as theswitch-points move with the motion-plate the switch-lever will be throwntherewith and successively engage the contactheads 114 vand 115, thusgradually reducing the active length of the field coil 117 and power ofthe motor until the switch is fully opened and the switchlever 111engages the contact-head 116, when the circuit is broken by the switch78, as previously described here in. Reversely,when the railway-switchis to be closed the rheostatic arrangement described sends the currentthrough the contact-head 116 and the full length of the iield-coil 117to start the switch-points and then gradually reduces the power of themotor until the motorcircuit is broken by the closing of therailway-switch. It will be understood that the intermediatecontact-heads 114 and 115 may be omitted, thereby doing away with therheostatic feature of the motor last described. It will be understoodthat should there be any physical displacement ofthe switch-points andmotion-plate after they have been set by the operator and Without hisknowledge, electric connection always existing between eithercontact-heads 83 and 84 or 85`and 86, as the case may be, the motor willautomatically be at once energized to force the motion-plate andswitch-points back to their proper position. Fig. 2 shows a method ofconnecting the operating-lever 36 with the tappet or follower 118 of awell-known interlocking device. Of course for the electric unitsdescribed-the motor for the motion-plate and the magnet for the lockingdevice--other units-as, for instance, a solenoid-may be substituted.

What I claim, and desire to secure by Letters Patent, isl 1. In electricapparatus for operating railway switches, signals, and the like, thecombination with the motion plate or device to be moved and theelectromotive circuit, of an electric switch in said circuit, a devicefor operating said switch, and an electrically-controlled locking devicefor automatically locking said switch-operating device against acomplete return after it has been moved in either direction to energizethe electr-emotive current, said locking device comprising a mechanicaldevice operated by a single electric unit. 2. I n electric apparatus foroperating railway switches, signals, and the like, the combination withthe motion plate or device to be moved and the electromotive circuit,ot' an electric switch in said circuit, a device lor operating saidswitch and an electrically-controlled locking device for automaticallylocking said switch-operating device against a complete return in eitherdirection after ithas been moved to energize the electromotive circuit,until after the motion plate or device has been moved thereby to itsfull extent, said locking device comprising' a mechanical deviceoperated by a single electric unit.

' 3. In electric apparatus for operating switches, signals and thelike,the combination with theV motion plate or device to be moved, and theelectromotive circuit, of an electric switch in said circuit, a devicefor operating said switch, an electrically-controlled locking device forlocking said switch-operating device against a complete return in eitherdirection after it is moved to fenergize the electromotive circuit, saidlockingV device comprising a mechanical device operated by a singleelectric unit, and automatic means Jfor unlocking the switch-operatingdevice when the motion plate or device is fully thrown and the handle ismoved farther toits full extent.

4. In electric apparatus for operating switches, signals and the like,the combination with the motion plate or device to be moved and theelectromotive circuit, of an electric switch in said circuit having anoperating device, a locking device actuated by a single electric unitfor said operating device, means for automatically releasing saidlocking .device when the operating device is moved partially in eitherdirection, and means for automatically preventing the release or' saidlocking device it' an accidental current is in the circuit, so as toindicate to the operator that fact.

5. In electric apparatus for operating switches, signals and the like,the combination with the motion plate or device to be moved, and theelectromotive circuit of an electric switch in said circuit having anoperating device, a locking device actuated by a single electric unit,for automatically locking said operating device against a returnmovement in either direction after it is moved to'energize theelectromotive circuit, automatic means for unlocking theswitch-operating device and thereby indicating to the operator when themotion plate or device is fully thrown, and means whereby, when themotion plate or device is not fully thrown and the locking device notreleased, and the operating device is then thrown back again, thelocking device will be automatically released to permit the said returnof the operating-handle.

6. In electric apparatus for operating switches, signals and the like,the combination with the electromotive circuit oi' an electric switch insaid circuit, a device foroperating said switch provided with a lug orshoulder, a movable pin orstop to engage said lug IOO IIO

or shoulder, an electromagnet and connection for operating said pin orstop, and automatic means whereby, after said switch is moved by itsoperating device in either direction to energize the electromotivecircuit, the magnet causes the pin or stop to engage the lug or shoulderand lock the operating device against a return movement and when theoperating device and switch are moved to their full eX- tent the magnetfrees the pin or stop from said lug or shoulder and thus releases theoperating device or switch.

7. An electric apparatus for operating switches, signals and the like,the combination with the motion plate or device to be moved and theelectromotive circuit, or' an electric switch to govern the current insaid circuit having an operating device, a device actuated by a singleelectric unit for locking said switch and operating device, an electricswitch operated automatically by the movement of the motion plate ordevice, means whereby the operation or' said automatic switch causes theoperators switch and operating device to be temporarily locked by theelectromagnet locking device against a return movement in eitherdirection after being operated to energize the electromotive circuit.

8. In electric apparatus for operating switches, signals and the like,the electric switch to be automatically operated by the motion plate ordevice, comprising four pairs of iixed insulated contact-heads; and aforked movable member, having on one branch two long-circuit closers toengage and connect alternately two alined pairs of said contactheads,and on the other branch a 'short-circuit closer to engage and connectalternately the other two alined pairs oi' said contactheads,substantially as described.

9. In electric apparatus for operating switches, signals and the like,the combination with the motion plate or device, the electric motor tomove the same, and the motorcircuit, of a rheostatic device operatedautomatically by the motion plate or device to throw on the full powerof the field-magnets of the motor to start the motion plate or deviceand reduce the power of said'tield-magnets as the motion plate or deviceprogresses.

l0. In electric apparatus for operating switches, signals and the like,the combination with `the motion plate or device, the electric motoroperatively connected therewith and the motor-circuit, of a switch insaid circuit automatically operated by the motion plate or device toreverse the direction ofthe current through the motor field-coil, afterthe motion plate or device is fully moved.

11. In electrical apparatus for operating switches, signals and thelike, the combination with the motion plate or device, the electricmotor operatively connected therewith and the motor-circuit, of arheostatic device operated automatically by the motion plate or deviceto lead the circuit into opposite ends of the motor lield-coil as themotion plate or device moves in opposite directions, and a switch insaid motor-circuit automatically operated by said motion plate or deviceto lead -the current from the end of the iieldcoil opposite to that intowhich the current enters, at the initial movement of the motion plate ordevice in either direction so as to utilize the full power of the motorat that time.

12. In electric apparatus the combination or' a motion plate or part tobe moved with an electric motor to move the same, a motorcircuit, arheostatic device operated automatically by said motion-plate to throwon the full power of the field-magnets of the motor to start saidmotion-plate and reduce the power of said field-magnets as saidmotionplate progresses.

13. In electric apparatus for operating switches, signals and the like,the combination with the motion plate or device, the electric motor tomove the same, and a switch with means whereby connection is madethrough said switch for operating the motor upon a movement of saidmotion-plate.

111. In electric apparatus for operating switches, signals and the like,the combination with the motion plate or device, the electric motor tomove the same, said motor having two iields each for producing adiiiierent movement of the motor, and the motor-circuit of an electricswitch to govern said motor, said switch comprising a stationary partand two parts movable with reference to said stationary part.

15. In electric apparatus for operating switches, signals and the like,the combination with the motion plate or device, the electric motor tomove the same, said motor having two lields each Jfor producing adifferent movement of the motor, the motor-circuit and indicatoroperated by a single electric unit, an electric switch to govern saidmotor and said single electric unit, said switch comprising a stationarypart and two parts movable with reference to said stationary part.

16. In electric apparatus for operating switches, signals and the like,the combination of the motion plate or device to be moved with anelectric unit to move the same, two electric switches each adapted tomake and break fourA electric circuits, an indicator operated by asingle electric unit and four circuits connecting said irst-rnentionedunit and said second electric unit through said electric switches.

17. In electric apparatus for operating switches, signals and the like,the combination of the motion plate or device to be moved with anelectric motor to move the same, said motor having two elds each forproducing a different movement of the rnotor, two electric IOO IIO

IO motor having two fields each for producing a different movement ofthe motor, two electric switches each adapted to make and break fourelectric circuits, an indicator operated by a single electric magnet andfour circuits connecting said motor and Said magnet through I5 saidelectric switches.

In testimony whereof I have hereunto set my hand this 4th day ofOctober, 1904.

. LAV. GRIFFITH. Y In presence of- FRANCIS F. FIELD, J. F. BONDREAU;

